NoteViewController.swift

//
//  NoteViewController.swift
//  Notes
//
//  Created by Julian Moorhouse on 15/08/2019.
//  Copyright © 2019 Mindwarp Consultancy Ltd. All rights reserved.
//

import UIKit

class NoteViewController: UIViewController {

    var note: Note?

    var didUpdateItem: ((_ item: Note) -> Void)?
    var didDeleteItem: ((_ item: Note) -> Void)?

    @IBOutlet var textField: UITextView!
    
    override func viewDidLoad() {
        super.viewDidLoad()

        navigationController?.navigationBar.prefersLargeTitles = false

        navigationItem.backBarButtonItem = UIBarButtonItem(title: "", style: .plain, target: nil, action: nil)
        
        let share = UIBarButtonItem(barButtonSystemItem: .action, target: self, action: #selector(shareTapped))
        navigationItem.rightBarButtonItems = [share]


        textField.text = note?.content
        
        let notificationCenter = NotificationCenter.default
        notificationCenter.addObserver(self, selector: #selector(adjustForKeyboard), name: UIResponder.keyboardWillHideNotification, object: nil)
        notificationCenter.addObserver(self, selector: #selector(adjustForKeyboard), name: UIResponder.keyboardWillChangeFrameNotification, object: nil)
        
        let delete = UIBarButtonItem(barButtonSystemItem: .trash, target: self, action: #selector(deleteNote))

         setToolbarItems([delete], animated: true)
    }
    
    override func viewWillDisappear(_ animated: Bool) {
        super.viewWillDisappear(animated)
        
        if let thisNote = self.note {
            thisNote.content = textField.text
            
            didUpdateItem?(thisNote)
        }
    }

    @objc func deleteNote() {
        if let thisNote = self.note {
            didDeleteItem?(thisNote)
        }
        navigationController?.popViewController(animated: true)
    }
    
    @objc func adjustForKeyboard(notification: Notification) {
        guard let keyboardValue = notification.userInfo?[UIResponder.keyboardFrameEndUserInfoKey] as? NSValue else { return }
        let keyboardScreenEndFrame = keyboardValue.cgRectValue
        let keyboardViewEndFrame = view.convert(keyboardScreenEndFrame, from: view.window)
        
        if notification.name == UIResponder.keyboardWillHideNotification {
            textField.contentInset = .zero
        } else {
            textField.contentInset = UIEdgeInsets(top: 0, left: 0, bottom: keyboardViewEndFrame.height - view.safeAreaInsets.bottom, right: 0)
        }
        
        textField.scrollIndicatorInsets = textField.contentInset
        
        let selectedRange = textField.selectedRange
        textField.scrollRangeToVisible(selectedRange)
    }

    @objc func shareTapped() {
        let vc = UIActivityViewController(activityItems: [textField.text ?? ""], applicationActivities: [])
        vc.popoverPresentationController?.barButtonItem = navigationItem.rightBarButtonItem
        present(vc, animated: true)
    }
}